RC9/qpid/java/broker/src/test/java/org/apache/qpid/server/subscription/QueueBrowserUsesNoAckTest.java

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package org.apache.qpid.server.subscription;

import org.apache.qpid.server.util.InternalBrokerBaseCase;
import org.apache.qpid.server.protocol.InternalTestProtocolSession;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.AMQException;

import java.util.List;

public class QueueBrowserUsesNoAckTest extends InternalBrokerBaseCase
{

    public void testQueueBrowserUsesNoAck() throws AMQException
    {
        int sendMessageCount = 2;
        int prefetch = 1;

        //Check store is empty
        checkStoreContents(0);

        //Send required messsages to the queue
        publishMessages(_session, _channel, sendMessageCount);

        //Ensure they are stored
        checkStoreContents(sendMessageCount);

        //Check that there are no unacked messages
        assertEquals("Channel should have no unacked msgs ", 0,
                     _channel.getUnacknowledgedMessageMap().size());

        //Set the prefetch on the session to be less than the sent messages
        _channel.setCredit(0, prefetch);

        //browse the queue
        AMQShortString browser = browse(_channel, _queue);

        _queue.deliverAsync();

        //Wait for messages to fill the prefetch
        _session.awaitDelivery(prefetch);

        //Get those messages
        List<InternalTestProtocolSession.DeliveryPair> messages =
                _session.getDelivers(_channel.getChannelId(), browser,
                                     prefetch);

        //Ensure we recevied the prefetched messages
        assertEquals(prefetch, messages.size());

        //Check the process didn't suspend the subscription as this would
        // indicate we are using the prefetch credit. i.e. using acks not No-Ack
        assertTrue("The subscription has been suspended",
                   !_channel.getSubscription(browser).getState()
                           .equals(Subscription.State.SUSPENDED));       
    }

}